MICROSOFT was fined 561 million Euros by the European commission for not giving users a choice of web browser when they logged into Windows computers in Europe between May, 2011 and July of last year.
This broke a commitment the firm made in 2009.
The mistake occurred when Microsoft programmers forgot to add a line of code which would have offered the browser choice program on versions of Windows 7 running its first major update - Service Pack 1.
This resulted in roughly 15 million users missing out on a number of options.
Microsoft realised the problem and contacted the EC's competition arm to admit the error.
The company said it accepted full responsibility for the error and apologised.
A statement read: "We provided the commission with a complete and candid assessment of the situation, and we have taken steps to strengthen our software development and other processes to help avoid this mistake - or anything similar - in the future."
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